THE PYROCHLORE -] HTB -] REO3 SUCCESSIVE PHASE-TRANSITIONS OF FEF3

Authors
FEREY G PARMENTIER J
Citation
G. Ferey et J. Parmentier, THE PYROCHLORE -] HTB -] REO3 SUCCESSIVE PHASE-TRANSITIONS OF FEF3, European journal of solid state and inorganic chemistry, 31(8-9), 1994, pp. 697-704
Citations number
20
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
European journal of solid state and inorganic chemistry → ACNP
ISSN journal
09924361
Volume
31
Issue
8-9
Year of publication
1994
Pages
697 - 704
Database
ISI
SICI code
0992-4361(1994)31:8-9<697:TP-H-R>2.0.ZU;2-C
Abstract
FeF3 exists under one amorphous and three crystalline forms correspond ing to the defect pyrochlore (Pyr)., the hexagonal tungsten bronze (HT B) and the ReO3 (R) structure types respectively. The neutron thermodi ffractometry study of Pyr-FeF3 shows that it transforms irreversibly f irst into the HTB and then into the R forms at 315 and 385 degrees C r espectively. Some elements of a plausible mechanism for the transforma tion are proposed.